How to do it:

1.

Start in a lunge position with your right knee bent and your left leg extended straight behind you.

2.

Reach your arms straight out in front of you at chest height — palms touching, fingers extended and thumbs up. Open arms straight out to the sides, then return them to the starting position to complete one rep.

3.

Do four sets of 8-15 reps, switching the forward leg each time you lunge.

Special considerations:

To boost your cardio workout and the number of calories you burn, do your reps while walking or jogging across the pool.